Abstract
Interactions between Oesophagostomum columbianum and Oesophagostomum venulosum were studied by comparing the establishment, development and distribution of each species in single and mixed infections in sheep. The establishment of O. venulosum was reduced by 90 % in sheep previously infected with O. columbianum and by a mean of 50 % in sheep given a simultaneous concurrent infection with O. columbianum. Prior or simultaneous infection with O. venulosum had little or no effect on the establishment of O. columbianum. It is concluded that the increase in incidence of O. venulosum in sheep on the Northern Tablelands of New South Wales has been consequent upon but not the cause of the decline in incidence of O. columbianum. The decline in O. columbianum has probably occurred because of a combination of factors including the failure of infective larvae to overwinter on pasture, the use of efficient anthelmintics and changes in pasture composition.
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